One guy known as HP springs to mind from my old 10MCM days; he started life as a Muppet, but rebadged to steward when he found he couldn't hack it on the sweepdeck.
After one sea weekend we'd returned to port and were cleaning up prior to rounds; AB Muppet was assisting the chef in the galley, straight after Sunday dinner. The chef asks the Muppet to check whether any of the hot-plates on the range are on; the chef assumed that Muppet would simply look at the swiches on the deck-head, but no, AB Muppet goes for the more direct approach by placing his hand flat on each plate in turn uttering the words, "this one's off, this one's off, this one's off, shit! that one's on!" - result one blistered hand and the immediate new knick-name of "HP". Fast forward a few months, and Baby Steward HP is again assisting in the galley - chef asks his to check the temperature of the water in the urn; HP's response was to open the tap and put his hand full in the stream of steaming nearly boiling water to earn himself another trip to the coxswain for immediate first aid.